$ _SESSION []操纵

Question

我愿意在我的项目中实现一个菜单栏，对几个用户有一些限制。我在设置时遇到了一些困难。

<?php 
//ENTER THE RELEVANT INFO BELOW
$mysqlUserName      = "root";
$mysqlPassword      = "";
$mysqlHostName      = "localhost";
$DbName             = "test";
$backup_name        = "mybackup.sql";
$tables             = array("msc_market", "mytable1","mytable2","mytable3");

Export_Database($mysqlHostName,$mysqlUserName,$mysqlPassword,$DbName,  $tables, $backup_name );

function Export_Database($host,$user,$pass,$name,  $tables=false, $backup_name=false )
{
    $mysqli = new mysqli($host,$user,$pass,$name); 
    $mysqli->select_db($name); 
    $mysqli->query("SET NAMES 'utf8'");

    $queryTables    = $mysqli->query('SHOW TABLES'); 
    while($row = $queryTables->fetch_row()) 
    { 
        $target_tables[] = $row[0]; 
    }   
    if($tables !== false) 
    { 
        $target_tables = array_intersect( $target_tables, $tables); 
    }
    foreach($target_tables as $table)
    {
        $result         =   $mysqli->query('SELECT * FROM '.$table);  
        $fields_amount  =   $result->field_count;  
        $rows_num=$mysqli->affected_rows;     
        $res            =   $mysqli->query('SHOW CREATE TABLE '.$table); 
        $TableMLine     =   $res->fetch_row();
        $content        = (!isset($content) ?  '' : $content) . "\n\n".$TableMLine[1].";\n\n";

        for ($i = 0, $st_counter = 0; $i < $fields_amount;   $i++, $st_counter=0) 
        {
            while($row = $result->fetch_row())  
            { //when started (and every after 100 command cycle):
                if ($st_counter%100 == 0 || $st_counter == 0 )  
                {
                        $content .= "\nINSERT INTO ".$table." VALUES";
                }
                $content .= "\n(";
                for($j=0; $j<$fields_amount; $j++)  
                { 
                    $row[$j] = str_replace("\n","\\n", addslashes($row[$j]) ); 
                    if (isset($row[$j]))
                    {
                        $content .= '"'.$row[$j].'"' ; 
                    }
                    else 
                    {   
                        $content .= '""';
                    }     
                    if ($j<($fields_amount-1))
                    {
                            $content.= ',';
                    }      
                }
                $content .=")";
                //every after 100 command cycle [or at last line] ....p.s. but should be inserted 1 cycle eariler
                if ( (($st_counter+1)%100==0 && $st_counter!=0) || $st_counter+1==$rows_num) 
                {   
                    $content .= ";";
                } 
                else 
                {
                    $content .= ",";
                } 
                $st_counter=$st_counter+1;
            }
        } $content .="\n\n\n";
    }
    //$backup_name = $backup_name ? $backup_name : $name."___(".date('H-i-s')."_".date('d-m-Y').")__rand".rand(1,11111111).".sql";
    $backup_name = $backup_name ? $backup_name : $name.".sql";
    header('Content-Type: application/octet-stream');   
    header("Content-Transfer-Encoding: Binary"); 
    header("Content-disposition: attachment; filename=\"".$backup_name."\"");  
    echo $content;
}
?>

PHP是选择IF语句中的第一个，如果我将更改它将放置半菜单.nav的顺序。

Answer 1

请尝试以下代码

   <?php
     session_start();
     $username=$_SESSION['username'];
    ?>
    <ul class="nav">
    <?php
        if($username == "usern1"){
    ?>
        <li class="nav-item">
            <a class="nav-link active" href="#">Active</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Link</a>
          </li>
          <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
          </li>
       <?php
        } elseif ($username =="usern2") {
       ?>
         <!-- Add your li html menu here -->
       <?php
        }
       ?>
    </ul>

Answer 2

<?include ("scripts/DBconnection.php");
session_start();
if(!isset($_SESSION[username])){
    header('location:login.php');
}else{
    $username = $_SESSION[username];//if I do something like this $username = "mike"it still show me the first if condition.... i dont get why...
}?>
<html>
<head>
....
</head>
<body>
<div class="row">
    <ul class="....">
<?if($username == "roma" || "mark"){?>
        <li class="nav-item">
            ...
                </li>
                <li class="..">
                .
                </li>
                <li class="...">
                ...
                </li>
               </ul>
               <?}elseif($username == "mike"){?>
                <li class=".">
                .
            </li>
            <li class=".">
               .
            </li>
            <li class="nav-item dropdown">
              .
            </li>
            <li class="nav-item">
                .
            </li>
            <li class="nav-item">
                .
            </li>
            <li class="nav-item">
               .
            </li>
            <li class="nav-item pull-xs-right">
               .
            </li>
            <li class="nav-item pull-xs-right" style =" font-size:15px; padding-top:7px; padding-right:50px">
                .
            </li>

        </ul>
            <?}?>